Preservation
Restoration & Conservation
Original material carries information that cannot be recovered once removed. This section separates three activities that are often confused, and states plainly where amateur work destroys value and where it is reasonable.
Definitions
Conservation, restoration, repair
Conservation
Stabilising an object and preventing further deterioration while changing as little as possible. Corrosion is arrested, not polished away; surfaces are cleaned, not refinished.
Restoration
Returning an object toward a previous state, which necessarily involves interpretation and loss. Every restoration decision should be documented and, ideally, reversible.
Repair
Making the object work again. Legitimate and often necessary — but a repair that discards original parts is a permanent trade of evidence for function.
Practice
Operations and their risks
Reasonable for an informed owner
- Gentle external cleaning of a case with appropriate, non-abrasive materials
- Correct storage: stable humidity, away from heat, movements unwound for long storage
- Photographic documentation before any intervention
- Recording service history with dates and named workshops
- Sourcing a correct replacement crystal rather than an approximate fit
Professional work only
- Full disassembly, cleaning and lubrication of a movement
- Mainspring replacement, especially in fusee and spring-barrel clocks
- Balance staff, pivot and jewelling work
- Escapement adjustment and rate regulation
- Dial conservation — refinishing a dial is usually irreversible value loss
- Rust treatment on steel components
A wound mainspring stores substantial energy. Attempting escapement or barrel work without training risks injury to you and permanent damage to the movement.
Principle
When to leave it alone
A watch that has not run for fifty years is not urgent. Running a dirty movement causes wear with every oscillation, so the correct first step is usually to stop — not to wind it repeatedly. Similarly, an original dial with hairlines is more informative and more desirable than a freshly repainted one, and a case with honest wear tells a story that polishing erases.
Where sources disagree on best practice — and they do, particularly on dial cleaning — this site states the disagreement rather than presenting one school as settled.
Further reading
Go deeper on this subject
Most damage to old watches and clocks comes from well-meant work done too early or too hard. These pieces explain why old lubricants fail, how cleaning and refinishing change an object, and how to judge when a professional is needed.
Articles
Restoration · 3 min
Conservation or Restoration: Deciding What Not to Do
Decide what evidence must survive before deciding whether a historic watch should run, look restored or remain unchanged.
Restoration · 4 min
Conservation Ethics for Clocks and Watches
Every intervention on a historic timekeeper destroys some evidence and preserves the rest. Conservation exists to make that trade-off deliberate, documented and reversible where possible.
Restoration · 4 min
Why Old Oil Destroys Movements
A running movement can still have unsuitable lubrication or worn bearings; service decisions need inspection rather than an assumption that running means healthy.
Restoration · 5 min
Storing and Handling Antique Clocks
More antique clocks are damaged in transport and storage than on the bench. Most of that damage is avoidable.
Restoration · 3 min
How Often Should a Mechanical Watch Be Serviced?
There is no single correct interval. Manufacturers often suggest periods around five to ten years, but use, lubricant condition, age and performance matter more than the calendar.
Restoration · 3 min
How to Clean a Pocket Watch Safely (and What Not to Do)
An owner can safely clean the outside of a pocket watch; the movement needs a watchmaker. This guide covers what to clean, what to leave alone, and the mistakes that cause lasting damage.
Restoration · 4 min
How to Move a Grandfather Clock Without Damaging It
Plan a longcase move around its actual construction and suspended loads; secure documentation and specialist help before lifting.
Restoration · 3 min
Why Does My Grandfather Clock Keep Stopping?
A stopping longcase clock has a symptom, not a confirmed diagnosis. Record the pattern and visible clearance safely before seeking clockmaker advice.
Academy lessons
Academy · Advanced · 40 min
Restoration Technique
Conservation-minded decision-making for antique and historically significant movements.
Academy · Advanced · 30 min
Dial Refinishing Versus Conservation
The trade-off between a bright, refinished dial and a worn but original one, and why collectors and conservators weigh it differently.
Academy · Advanced · 25 min
Case Conservation and Metal Fatigue
How cases age structurally — thinning, fatigue and metal loss from polishing — and why conservative case care preserves both integrity and value.
Academy · Intermediate · 25 min
Cleaning Theory and Ultrasonic Risk
What cleaning a movement is actually removing, and why ultrasonic cleaning is a precise process rather than a general-purpose fix.
Academy · Beginner · 20 min
Safe Disassembly Principles
The general principles that make disassembly reversible and safe, before any hands-on technique is taught.
Academy · Advanced · 35 min
Dial and Case Conservation
Conservation-minded treatment of dials and cases, and why refinishing is generally avoided.